NOAA S-57 chart cell
Bassa Bassa Bay and Timbalier Bay - Gulf of America
US4LA1EM
- Usage band
- Approach · code 4
- Current edition
- 1.2
- Features
- 3,891
- S-57 layers
- 55
- Published
- Jun 10, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 29.40000° N
- South
- 29.10000° N
- West
- 90.30000° W
- East
- 90.00000° W
- Center
- 29.25000° N, 90.15000° W
- Bounds area
- 283 sq nm
- Feature density
- 13.7457 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 70.7
- Smallest layer
- 1
- Largest layer
- 878
- Area sq km
- 971
- Features per sq km
- 4.0076
- COALNE Coastline 878
- LNDARE Land area 782
- LNDRGN Land region 542
- SLCONS Shoreline construction 277
- RIVERS River 144
- DEPARE Depth area 139
- DEPCNT Depth contour 131
- SEAARE Sea area 118
- SBDARE Seabed area 90
- OBSTRN Obstruction 87
- M_QUAL Data quality 85
- BCNSPP Special purpose beacon 81
- LIGHTS Light 76
- CANALS 55
- OFSPLF 48
- DAYMAR 46
- PIPSOL 40
- PILPNT 26
- LAKARE 25
- WRECKS Wreck 25
Nearby Chart Cells
Approach usage band
Current Edition Files
The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4LA1EM.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1EM/1.2/US4LA1EM.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1EM/1.2/US4LA1EM.001
- S-57 update 002 https://charts.openships.ai/noaa/s57/approach/US4LA1EM/1.2/US4LA1EM.002
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1EM/1.2/US4LA1EM.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1EM/1.2/US4LA1EM.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1EM/1.2/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.2 | Jun 10, 2025 | metadata.json |